Synthesis and characterization of two novel organic–inorganic hybrid solids from Keggin ions and metal coordination complexes

Two new hybrid compounds, [Co(4,4′-bpy)2(H2O)4][(4,4′-bpyH2]2[CoW12O40]·8H2O (1) and [Fe(2,2′-bpy)3]3[H2W12O40]·6H2O (2), (4,4′-bpy = 4,4′-bipyridine, 2,2′-bpy = 2,2′-bipyridine) have been hydrothermally synthesized. These solids were characterized by elemental analysis, thermogravimetric analysis, UV–Vis spectroscopy and X-ray diffraction. The hydrogen-bonding interactions in 1 lead to the formation of a three dimensional network consisting of [CoW12O40]6− anionic clusters, [Co(4,4′-bpy)2(H2O)4]2+ cations and lattice water molecules, while the discrete Keggin ion [H2W12O40]6− in compound 2 is surrounded by 14 [Fe(2,2′-bpy)3]2+ complexes through CH⋯O interactions (2.24–2.56 Å).

Graphical abstractTwo new hybrid compounds, [Co(4,4′-bpy)2(H2O)4][(4,4′-bpyH2]2[CoW12O40]·8H2O (1) and [Fe(2,2′-bpy)3]3[H2W12O40]·6H2O (2), have been hydrothermally synthesized. Hydrogen-bonding interactions in 1 lead to the formation of a three dimensional network, while the Keggin ion [H2W12O40]6− in compound 2 is surrounded by 14 [Fe(2,2′-bpy)3]2+ complexes, with CH⋯O interactions in the range 2.24–2.56 Å.Figure optionsDownload full-size imageDownload as PowerPoint slide